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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7249f7db1cd1f1f51d51cf95f83fdaf22ad50e75e2a4829c6bbaf23e5ce7c19b' 
  AND token = 'fGbroCutBhtstRDBCKTTjwgQGb+wjHS+kEla4ylYb2E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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