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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1905da1334f40097bec6a23383d1ed1f0518e85d847e10d53546fe9ea77e50e7' 
  AND token = 'OQX6jXNF8C1ItRvXHF6/pHaUFhcdpRKGyr/X5/Sa3dI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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