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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'da07cb7901a88d1ef87c2facb88ab16ab1202af3499c308a4b27dc3317e830e8' 
  AND token = '0+UAGpgzJSvUpj2W4PWeLToQm7v5LdMKWcldhc9tX/E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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