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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f4307a91a09658d3a7e1acbeb684572584c67adae559d09d1d5a08e8f18484d4' 
  AND token = '5wXv0fnWKkeFd69FvbTS3P9Cnv19mESr8y/cxdVVzqY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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