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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a62f8ed5d9374d49a4784d69c15791bf144e36727ed0b9a5085a47a8d7313151' 
  AND token = 'IzwEO3Pkg+GvW+79tHTuZsQW7ZolLUGAeW6Im1qeS+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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