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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1fa2c8b5d56b5b0ef524c513a01c0d6fdc943cce0dc05d07002ff9ce10b88e13' 
  AND token = 'n3OPSEqPducQy4ItZxhNiGQABmVUa3Zj9LoEte2YBTg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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