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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7844f2b3f9870dce03bbdd8442c42e1d8f8f1e405696c900a33768422482acb3' 
  AND token = '1kjJH24b6ft1lcl/2PjQnwtsZUy4gFEfUBPjjbK5Vi0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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