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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '862efba894ea6b5ece8f9a11712bc74c4a6b578312077183b918c67d82c16d73' 
  AND token = '3QWgPdXuoCOzkP9gA8TUuLWq/osRyBXlvoouhum2Obo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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