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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6c21ad118e61aff5d6061c3076418d40e000bcc46e00651aa1df329860a87ad3' 
  AND token = 'Xe9Q6YjSE7rOwfn86x9fYkHrL0c3PoNMjWRhs9vH2mQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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