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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ebd6531e3c7392cc667177764e155ae1dc4135f794d3de0289145a48ccf20e6d' 
  AND token = 'BQ5m3hUPlRIxA196PU7wdVd6wTu5U3DgiVYm7Ca84Lk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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