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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '42b7a2fab3ac7cf59babb7d1dad46f0d3db1d67a35f367c37817bda257824915' 
  AND token = 'PWS8hNg11VdQ8/C3ac35IFtgU2fG8Il6hSuU8PRY3nU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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