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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '168ea7448c43201575ca879c4fb2fff983af1357e119df9724ec95a05cc8c09e' 
  AND token = '2Bt8pZy+H7m1poU02HCOs0+BtlFrm2DuLQMZzwMVbX8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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