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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '206c737063f2f0e0fcbee85ee8ae67e4e6fa2ebd7a1806668a4322a3f79e624b' 
  AND token = 'LOc9OYDWJ0audCHL+ccVVmgMib7CSJVqfk06eigOoJ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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