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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ab2f352991a62a2c67bfbd06775b7d7be081e779724a6ff5f2aeea41ad4df876' 
  AND token = 'cvp34KIs0yHFqHlK1n/s6sahyDCe8AkXMx1UxnL0/xQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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