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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5691ccddeeb0657751ec11f94c31cab4b9441ae9045b43c0c227a89b9f85c6e6' 
  AND token = 'IChPyBR7mPefl00Jo3PvEu0JdCSRUNceCu+rN2mUrNg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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