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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4abc4fd5760a021be0c3bc918615898938467a3e3fb09f0c11aca44f29ed788d' 
  AND token = '9zfp4KmfD9mGdoE7JEo3v15lH8ExwNgpwG4ZDKp7pI0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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