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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b71b77d9b95aca19d9ba4011fb987683308c7e20f4003c410ebbcca74ae9c3c4' 
  AND token = 'RbUaxU7T/kU2LAJ+AXHk5XspchhM8dIBhsBT6sxYdEE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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