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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a0b83140b82624b003789d605db6e1a444b37de0a5f09b2f7ed31d02e2028ae3' 
  AND token = 'PPyBps7RJtefKaHMXLAN68i1c83lIN6GajRoq1BzNt8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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