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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e70619cc271cb038eaa2180db6af61c4391fdcf02f9ffaee0bbf9b3cbf3c79d9' 
  AND token = 'oMXYqs7afI6plosU13TRlhOOkhvgiZ8RxxlwbBTabzM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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