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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '669e24a28229f8f7bd971f3ada627bc2733459bcaba52b51c2021598ad6f7201' 
  AND token = 'r2fiA5xytLlT9vWnrf+wiGIajvN2m4VbH9a62+cVFIA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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