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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c10f0a513eb5a48716abbe87c14a78ee70bea1b86143e06a175a4b6aa41f1a49' 
  AND token = 'uszF42a7dT/EVRqdBCDxkERwV7+cy6CyIM5cagwMvsQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}