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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dd819d55cd146a9d56359f0a43e9bfc8efd33489dae70d987f637cd7beade938' 
  AND token = 'd7Rnc4217/as/hZOV3kYEm9UlxJ7faU7h8XjyWOI0rw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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