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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '98c369e3ea4794a5b03b27b4aa6917ac871f826d674f56ed9ba529b12b6dfe6b' 
  AND token = 'Kknhm9Lp4wvltpQxOHYvJhJSWAD7pyTkdPXkJPipe9I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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