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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b9ad19722d9fa88211b4e537eb8c093eb2761f5695603f6499b0167d26bdf1bc' 
  AND token = 'egZjsauOisL5n0S+NHND7LOKF3hbpxSTIk6gIVNeNjY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00064

JSON explain

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