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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1bba233db44a56f7f390218a32bc34e80a6c9b7dad32e22026ea8a1465302ec3' 
  AND token = '0wLwy27sljA8RpHORSq1IDyeumoL9DfxsBmghXxhDko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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