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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f451ef4380064d2a5f45ee9ab76b3461217481c64ed89d210fdb356cceee2be9' 
  AND token = 'SYVUU6Ibg6EHwDmKWnL3Ez4mPBEw0H9ImIlwFHbEoQ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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