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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8d1b4191b8012e409132e0ed33edc6a9e349ad17bbb1f83c39b4a4158e52f058' 
  AND token = 'c/3DWY8RUI8lQp4uJuwey5MzYU/gA2BuuEP4tAAIsyw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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