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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e83e421459e166ebdb2289e899a5212a8c5cfb4d8f94f425b134d8ccf1efcc35' 
  AND token = 'wlRg8ecs+plAp03Q9Ex0ibCxQ3ppReZ0OoQPMw+kaek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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