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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '71a6a53e0796a37af5461f296187b060838989a8d841f4e10c9302c9f0255a5f' 
  AND token = 'ELq0gP+G5CxP9LrB2AfPeqRUhxQrE8SMl+i7+Jw5o28=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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