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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4ffe9582b0c0b9c1017f5b2e872579ee0d038ddb61bbe5cffae71427c03675ca' 
  AND token = 'TRFTQ6q80Rd0ap1u830CRsY0OjkL+6cnb9r5tEjC9Pg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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