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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e6205bc9080172d84e8e82628fdde02461c4472e986a7be3e31530476393c71b' 
  AND token = 'd8XPv6DPTTScEThxi7koemYujZbr7If9ADkRDsQ9F7M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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