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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a49c3df4227f19aae35cd0a7141f61efc0cdeb4572caa3b56c7aebb994b8efd5' 
  AND token = 'WrilT/FnMBQMymSlypgqS764Q3Xv2/qkR8OJdOEsUck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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