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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '833abb5146d030c1cc3b36e956e9d87f09dcbb0ade78cf6f6fb63538a27d703d' 
  AND token = 'l9DxnXQd3waL9vavY/s9D4/oh8EeeVHNc7UcUxDWZhs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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