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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4b7057a27f76f11f9438f5c846481d6e99c9bdcd104af667f7e62122ccf71b10' 
  AND token = 'JFaUoHEKeCd/EPGeW97sSsZctHtn2Lf70oh9URNWZEg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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