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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e4312c7d334ff9f04eea91ad7b16a45995ac8ff5b5de0aefd2f4db0697c220d0' 
  AND token = 'CKP15z9XKvps40+kZBKbf5GYh7zsWdNnKMO08YRUUFc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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