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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '891d4c5d41414e1d8ac7efef1a02e41b1ba1c5989871078b0ceb6e92769dab5a' 
  AND token = 'XlXB4OVxsT6lz8wA/bBXepJlXdmdXhQ3cvNfWTwFS48=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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