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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dc5c762a66c88507585003b49e12b81bed64bd15c9cd61a944a51cf1f5bddddc' 
  AND token = 'PFU5a57xQwplBza7BhJJSv0LYP+otKZJocL1/di90iQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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