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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd0b5aade684a13827672a3edf1ba66fbd9caee06ce16091ae002ab64d6a172f3' 
  AND token = '9iQbQ/2r9kTmaqPI7rHwcthrHzY1goKOSm3eeXQ8woY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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