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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '71a7637e1bded88ac7c77a2df5c83282e5c9566a3628020996c48905a9fc53fe' 
  AND token = '4JwkDSChkC/Y84OC/Sem46fV36YU7C6iUeA3nbtgxP8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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