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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c090f80ffb074c4e4558ea81860cf6be3e61f79bcff0f2fa526e662e845d61c8' 
  AND token = 'o8+yRj76S4+WvwBiowofmH6V2G7HYH+ulZkb+aMR+c4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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