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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd55f4e1cdb35bdc7c7ca597316b4eeb220bc445ef70fe23f752594d1e1427caf' 
  AND token = 'U1d2TWCnFOMcROrH1fSCsrQbI91JyVn+1QFCiCqtJ7U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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