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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3735deb54237a02b3e924e60812f89d828b7f97de08b70ab8936ee9342920173' 
  AND token = 'm0kr+FDwtyYG1eWBp6qi238QljHOTOkWDrAoy/fTYNM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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