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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1cf9550f4ed522f066fe8f126d88c10388173323a7f513ad2e08e8952b17f5df' 
  AND token = 'aJgluZjBwfJQf86wfq/XRhHzm1ap6pTIQlEJw8xRoU8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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