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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '30e1a0f492c405492def6ab440f777de2b6e31303ef10f86f54fa5faf4bcc97a' 
  AND token = 'wSAmsQlJHf2LSws7xLIi9NbE8+YVLHVzOSuKkDy+NGk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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