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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2b287e761bdaf50c3f9ef565d3c14590f38c7331bad2c85e6d5c8a3102d05818' 
  AND token = 'FkSI5+EWbdXG3/IDLHkNTfdk5f33j6TWRblJHYDa+24=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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