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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'be9362750e7c62eadd8de253b48665fdfc1435979bfb736ed7721a1bf59aa8f3' 
  AND token = 'rdfY8xZefG3AtvAxE1yivEMGDanEzidgdu2aCAcm8Qo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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